{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1JA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1JA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1JA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1JA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-1JA15, for transformer protection, 10 A rated at 400 V, 100 kA breaking capacity, CLASS 10 trip class, screw terminals, 45 mm wide.","salesMarkdown":"## Transformer protection breaker, 10 A, 100 kA — what the ratings mean Rated 10 A continuous at 400 V, with a CLASS 10 trip class — the breaker opens within 10 seconds at 7.2× rated current, which is the standard for motor and transformer starting duty where the overload is brief but high. Breaking capacity hits 100 kA at 240 V and 400 V, drops to 42 kA at 500 V, and 6 kA at 690 V. No ground fault detection on this variant. ## Mounting and wiring — DIN rail, screw terminals, 45 mm wide At 45 mm wide, it occupies a single modular slot — fits standard panel layouts without crowding adjacent devices. Main circuit terminals are screw-type, accepting solid conductors 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), and stranded 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²). The auxiliary switch uses transverse design with 0 auxiliary contacts on this variant. Suitable for dry indoor panels only. Depth 96 mm, height 97 mm. Any mounting position allowed. Shock rated at 25g for 11 ms. ## Lifecycle and sourcing — current production, quoted to order Mechanical endurance rated at 100 000 cycles typical for the main contacts. Electrical endurance depends on switching frequency and load; at AC-3 duty the maximum switching rate is 15 operations per hour. ## Delta vs. 3RV2021-1FA15 — what changes The 3RV2021-1FA15 is a newer-frame sibling in the SIRIUS series. Both are 45 mm wide, DIN-rail mounted, and offer 10 A at 400 V with 100 kA breaking capacity. The 3RV2021-1FA15 uses spring-cage terminals instead of screw terminals on the main circuit — a difference in wiring preference, not in electrical rating. Panel cutouts and rail spacing are identical; a swap requires re-terminating but no enclosure modification.","metaTitle":"Siemens 3RV1421-1JA15 SIRIUS Circuit Breaker, 10 A, 100 kA","metaDescription":"Siemens SIRIUS 3RV1421-1JA15 circuit breaker for transformer protection. 10 A continuous, 100 kA at 400 V, CLASS 10 trip, phase failure detection. Current production. Quoted to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"45 mm","Height":"97 mm","Maximum":"2 000 m","at 24 V":"1 A","at 60 V":"0.15 A","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","at 230 V":"0.5 A","Backwards":"0 mm","Trip class":"CLASS 10","At The Side":"0 mm","Rated Value":"690 V","On The Front":"IP20","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Shock resistance":"25g / 11 ms","Mounting position":"any","Product brand name":"SIRIUS","Product designation":"circuit breaker","at 400 V rated value":"10 A","Design of the product":"for transformer protection","For Auxiliary Contacts":"0","Ground fault detection":"No","Phase failure detection":"Yes","For Main Current Circuit":"screw-type terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","Continuous current rated value":"10 A","Design of the auxiliary switch":"transverse","at AWG conductors for main contacts":"2x (14 ... 10)","Surge voltage resistance rated value":"6 000 V","at AC in hot operating state per pole":"3.1 W","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (18 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Removable Terminal For Auxiliary And Control Circuit":"No","Design of the overcurrent release and short-circuit release":"thermomagnetic","Arrangement of electrical connectors for main current circuit":"front side","Adjustable pick-up value current of the current-dependent overload release":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=27242&mlfb=3RV1421-1JA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1JA15/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RV1421-1JA15 accept on the main terminals?","answer":"Screw terminals accept solid 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), and stranded 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1JA15","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RV1421-1JA15 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}